Spark-plug



-J RANSOMER.

SPARK PLUG. APPLICATION rlLwAuml-flsn.

Patented Mar. 16, 1-920.

ATTORNEY UNITED STATES PATENT orrion.

JOHN RANSOMER, OF BATEsvIL n, ARKANSAS.

SPARK-PLUG.

Specification of Letters Patent. Patented B131. 16,1920.

. Application filed August 31, 1917. Serial no. 189,193.

To all whom it may concern:

Be it known that I, JOHN RANsoMnn, a.

citizen of the United States, residin at Batesville, in the county of Indenept ence and State of Arkansas, have invented new and useful IIIIPIOVQIHGI'lt-S in Spark-Plugs, of

which the following is a specification.

This invention relates to spark plugs, the main object of the invention being to produce what may be termed an oil proof or foul proof plug capable of being subjected to an excessive amount of lubricating oil without interfering with the operation of the plug, the electrodes of which have such touches the plug.

longitudinal section through the improved lplug. i

Referringto the drawings 1 designates the body or shell of the plug having the usual enlarged portion 2 formed with fiat faces to receive 'a ring, the shell also comprising a threaded portion .3 adapted to be screwed into and removed from the usual threaded opening in the cylinder of an internal combustion engine.

In carrying out the present invention, the body or shell 1 of theplug is formedwith a large central longitudinal bore 4 which forms a dead air space. At one end the body 1 is counterbo'red to form a rabbet or shoulder 5 in which is seated the inner end portion of an insulator Shaving a central bore through which is inserted the power electrode 7 A clamping nut 8 is threaded on the outer end portion of the electrode 7 and bears against the insulator 6. A binding post nut 9 is also threaded on'the same end. portion of the electrode 7 At its opposite end the shell or body 1 is counterbored to form another rabbet 01' seat 10 for a second insulator 11 which just- .tensifying the spark.

reaches to the inner extremity of the shell 1. An insulating spark deflectlng disk 12 of slightly less diameter than the external diameter of the-adjacentend of the shell or bod y l, rests against the inner extremity of the plug and seals the same against the admission of oil, carbon or other foreign matte An active disk 13 of carbon'or metal rests against the bottom 'Face of the insulating disk 12 and is of approximately the same diameter or a little less than that of the disk 12. The po er electrode 7 extends centrally through the insulator 11,

the insulating disk 12 and the carbon or metal disk or button 13.

The plug hereinabove described is especially efiicient when used in an engine employing heavier hydrocarbon oils or kerosene. It has been found by actual test that, in a kerosene engine, all ordinary plugs now on. the market will become foul in a very few minutes and cause stoppage of the en- -ginc. The improved plug has demonstrated its ability to keep clean by burning cit any lubricating or otheroil as rapidly as it reaches the plug. The improved plug has been runnin for a number of consecutive days and it is still running in perfect satisfaction.

The cap or button .13 is formed-with a central opening 1% of larger diameter than the power electrode for the purpose of inthcrefore, has no electrical contact with-the button 13, l'mt'insulation'lo is interposed between them. v

.I claim:

1. A spark plug having a body in the form of a shell, of conducting material, at stationary electrode passing through such; body, a closure in the form of a plug of insulating material at each end of the body and extending but partially'into the same, around the electrode, a substantial space existing between said plugs and between the sides of the shell and said electrode, where'- by a body of dead air-is inclosed in the shell around the electrode, a sparking button at one end of the body, contiguous to but insu- The electrode 7,

lated from the same, from which button-the said hole are spaced.

2. A spark plug having a body, trode passing through such body, and 1nsu' and a sparking button at 5 latecl therefrom,

one end of the body contiguous to but in:

snlated" from the same,

through a' hole in I which theelectrode passes, an intensifying air gap :being provided betWeegn-fihefilgctrode and button, where the electrode passes 10 through the button, said hole being closed to the exterior .of the plug on all sides.

In testimony whereof I afiix my signature. JOHN RANSOMER. 

